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Table 2: Characteristics of patients with MGD and SGD^{^a}
All subjects MGD SGD P Value
No. of patients 155 36 119 
No. of glands 216 97 119 
Mean age (yr) 60 (range, 14–88) 59 60 
Female 108 (67%) 25 (69%) 83 (70%) 
4D-CT characteristics 
    Mean size of abnormal glands (mm) 10.9 (5.9) 8.8 (4.0) 11.7 (6.4) .002
    Median size of abnormal glands (mm) (IQR) 10 (7–13) 8 (6–11) 11 (7–13) 
    No. <10 mm (%) 79 (37%) 39 (64%) 40 (34%) 
    No. <7 mm (%) 30 (14%) 19 (31%) 11 (9%) 
    No. >13 mm (%) 39 (18%) 6 (10%) 33 (28%) 
Prospectively detected lesions 
    1 100 10^{^b} 90 <.001
    ≥2 46 20 26 
    None 9 6 3 
Biochemical markers 
    Serum calcium level (mg/dL) 11.0 (0.7) 10.8 (0.4) 11.1 (0.7) .07
    Serum parathyroid hormone level (pg/mL) 117 (69) 92 (44) 122 (73) .02
    WIN 1279 (744) 1005 (501) 1357 (783) .01
MGD scores 
    Composite MGD score 2.6 (1.6) 4.1 (1.4) 2.2 (1.4) <.001
    4D-CT MGD score 1.6 (1.4) 2.9 (1.1) 1.2 (1.2) <.001
4D-CT sensitivity based on original radiology reports 
    Detection of lesions 167 (77%) 53 (55%) 114 (95%) 
    Detection of all lesions in individual patients 126 (81%) 12 (33%) 114 (95%) 
Note:—IQR indicates interquartile range.
↵a Values are expressed as mean (SD) except as specified.
↵b Twenty-five patients with MGD showed multiple lesions, and 5 showed single lesions after rereview of imaging studies following surgery.